CVSROOT:	/cvsroot
Module name:	pgsql-server
Changes by:	tgl(at)svr1(dot)postgresql(dot)org	04/01/03 23:51:52

Modified files:
	src/backend/nodes: copyfuncs.c outfuncs.c 
	src/backend/optimizer/path: clausesel.c costsize.c indxpath.c 
	src/backend/optimizer/plan: initsplan.c 
	src/backend/optimizer/prep: prepunion.c 
	src/backend/optimizer/util: clauses.c restrictinfo.c 
	src/include/nodes: relation.h 
	src/include/optimizer: clauses.h cost.h 

Log message:
	Merge restrictlist_selectivity into clauselist_selectivity by
	teaching the latter to accept either RestrictInfo nodes or bare
	clause expressions; and cache the selectivity result in the RestrictInfo
	node when possible.  This extends the caching behavior of approx_selectivity
	to many more contexts, and should reduce duplicate selectivity
	calculations.

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